A brief tutorial, for those of you living at the bottom of a mineshaft, or too busy re-alphatizing your rolodex to pay attention, for the past 15 years:

Clicking on this button:known as the “Reply” button, sends an email message in response to a previous message, but sends this message only to the person from whom the original message, well, originates.

Clicking on this, one, in comparison:

will send your message of response to EVERY SINGLE PERSON TO WHOM THE ORIGINAL AUTHOR DIRECTED THE MESSAGE.

These buttons should be used judiciously; with consideration and forethought.

For example, it is important for the person administering the training session to know whether you have taken it previously. The rest of us don’t actually need to know that you have taken it previously, and despite being, as a whole, reasonably sympathetic people, about this particular issue I think it’s safe to say that we probably don’t care. It’s not personal, it’s just that, well, we don’t care. It doesn’t affect whether we need to take it or not, it doesn’t affect how we feel about you as a person that you have managed to take the course before we did, and we’re not bringing the doughnuts, so we don’t need a headcount.

If not sure, click Reply. While we won’t actually thank you for it, because we won’t actually know, we are all nonetheless grateful.